May 2007 - The Supreme Court's April 2 decision in Massachusetts v. EPA, (No. 05-1120), has been hailed by some as the most important environmental law decision of the decade. In Massachusetts, the Court held that the Clean Air Act's definition of the term "air pollutant" is broad enough to encompass greenhouse gases (GHG) such as CO2, and that the EPA must therefore regulate such emissions if it finds that they are a threat to public health or welfare.

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